Sticky/greasy residue in hair?!?! Please help.?

You may just have product build up on it even though you don't use much and although the shampoo and condition has been washed out it can still leave a residue on the hair, I had a client not that long ago with the same issue my advice would be to buy a cheap basic shampoo for normal hair as these all have sulphate (in which slightly dearer better quality shampoos don't have) they don't have these because the sulphate is known to strip your hair especially coloured hair (which I know yours isn't ) but if you do have any sort of product, shampoo or conditioner build up it should sort it out! But if the problem was to persist I would contact your GP! Hope this was of help to you!